CN102606724A - Method for controlling wet type dual clutch transmission - Google Patents
Method for controlling wet type dual clutch transmission Download PDFInfo
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- CN102606724A CN102606724A CN2012100821485A CN201210082148A CN102606724A CN 102606724 A CN102606724 A CN 102606724A CN 2012100821485 A CN2012100821485 A CN 2012100821485A CN 201210082148 A CN201210082148 A CN 201210082148A CN 102606724 A CN102606724 A CN 102606724A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/006—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion power being selectively transmitted by either one of the parallel flow paths
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Abstract
The invention provides a method for controlling a wet type dual clutch transmission. According to the method, gear shifting is controlled to enable a system to provide the dynamics of a first target speed and then target speed change and final target position within a required time. The control scheme comprises that: the requirement of gear shifting dynamics is determined according to the current temperature of a gear box, even-number clutch speed, uneven-number clutch speed and the state of a clutch. Then the dynamics only changes when the speed exceeds the predetermined speed. If limit is in conflict, then an adaptability function is started to store a new value in comparison with that input previously. The method has the advantages that open-loop control and adaptability pressure are adopted to realize high-quality gear shifting, high stability and low pay expenses.
Description
Technical field
The present invention relates to two clutch gearbox control techniques, be specifically related to the controlling method that two clutch gearboxes switch.
Background technique
The method of the two clutch gearbox clutches of control is when gear shift: output shaft drives neutral gear, and input shaft is open to engine through the clutch of opening.The gear selection is to move gearshift mechanism through the power that driver generates, thereby the control of mobile synchronizer realization.
The layout of two clutch gearboxes has open in U.S. Pat 2658405, it has mainly explained the optional gearbox (DCT) of gear.Two clutch gearboxes have a cover even number gear graduation unit, comprise the gear of even number input shaft, even number clutch and even sets; One cover odd number gear graduation unit is arranged, comprise the odd number input shaft, the gear of odd number clutch and odd number group.When hanging up wherein one grade, be through connecting input shaft to shared output shaft.In alternately gear distributed, the even number gear train was the first cover transmission device, and the odd number gear train is the second cover transmission device.Distribute with such gear, gear shift operation is simply orderly, from current by the engage a gear position to the next one higher or lower gear, that is to say that as long as clutch can be locked, object gear just is set at next variable-speed unit.Gear shift operation begins from the clutch of the variable-speed unit at disconnection object gear place, and the combining target gear then breaks off the corresponding clutch of the current gear place variable-speed unit corresponding clutch of variable-speed unit at combining target gear place simultaneously.
Before the power assembly rate of change, the pre-hung gear position operation is automatic fully.So do not have in the noise intuition, smooth-going operation is wherein crucial.In order to reach this effect, the complicated and expensive controlling method that present state of the art provides not only can the control action dynamics can also control action speed.And the system complexity and increase system functionality and have the great market advantage of lowering category.In addition, in system response slowly, control cannot the tracking target profile, and this possibly cause the instability in the control.
Gearbox is the very important part of modern power assembly.Considerable research and development launch in the past, to improve the efficient of power assembly.As the part of these research and development, also as the result who improves modern control, the R&D work monograph of quite a few is on two clutch gearboxes.
The engage a gear position of two clutches is with common manual some is similar.The gear of each gear train is in its relative axle deploy, such as it along with axle rotates freely.Synchronizer is also in the axle deploy, along with axle rotates freely, so synchronizer can be from can optionally hanging up the gear on the axle.In the gearbox that automaticallyes switch, the device that is triggered usually of engage a gear mechanically drives to move synchronizer.Reverse gearset has comprised the gear of an input shaft, and the gear on countershaft, an intermediate gear form the reciprocal running of output shaft in other countershaft deploy and interlock, realize reverse gear.
Some common automatic transmission case have been captured in these pairs clutch, and the control gearbox is difficult automatically with machinery; But realize simultaneously that also controlling and limit the two clutch gearboxes that trigger automatically is very complicated processes, and the comfort standard of passenger's serious hope is in the past failed also up to standard.In gearbox, let with operation during the control that is fit to become in each gearshift procedure high efficiency also smooth-going be a very complicated thing.The controlling method of common automatic transmission case does not provide this ability basically.Just because of this, the existing related techniques exploitation comes the method for better control and the two clutch gearboxes of running.
One of them significant control progress is the link of expense contrast properties.Usually the exquisite degree demand of self-shifting gearbox is very high, so control electro-hydraulic system cost that can be up to standard is also very high.So low expense is low differentiates control system if a cover controlling method can be competent at, but can keep exquisite relatively, high-end control is able to exploitation, just can reduce a lot of costs effectively like this.
Existing regulations state is that most of link in gear is selected in closed loop control.This control is adopted widely and the demand High Accuracy Control is come guaranteed performance and stability.If control coarse or delay of response, be easy to cause instability so, this is because the error result of bad target following and a large amount.
Summary of the invention
So to the above-mentioned deficiency that existing technology exists, the present invention proposes a kind of method of controlling the wet type double-clutch speed changer, adopt open loop control to add that adaptability pressure realizes high-quality gear shift, high stability, low expense.
The present invention follows adaptability to be used as this invention inferior position is overcome as the method for control gear with open loop.
More particularly, the present invention directly is provided at first target velocity in the time range to control triggering system dynamics, and target velocity changes to the final goal position then.
The invention relates to the controlling method that two clutch gearboxes switch, comprise that the odd number clutch is connecting odd number input shaft and relevant odd number gear, the even number clutch is connecting even number input shaft and relevant even number gear.When gearbox carries out transmission through any one input shaft/clutch, half part in addition can be carried out the gear preliminary election.The meaning of gear preliminary election is that gear shifts to an earlier date on the clutch/output shaft of not transmission of pre-hung.Do like this be for gear switch in order to keep minimum to influence.
Controlling schemes of the present invention is through in the required time, and control gear realization system provides the dynamics of first target velocity, is that target velocity changes and the final objective position then.Special is that controlling schemes comprises that temperature, even number clutch speed, odd number clutch speed and the clutch state through working as front gear box decides gear shift dynamics demand.Then, this dynamics only can change outside predetermined in speed.If conflict has taken place limit, the adaptability function is unlocked so, can store the new numerical value of contrast front input
The needed step of this method comprises:
(1) confirm an axle moment of torsion, the synchronizer that its axis moment of torsion refers to activate obtains this moment of torsion at the moment of torsion of engine side through speed ratio and gearbox loss correction Engine torque;
(2) object gear of definite request, object gear is based on range state, throttle and the speed of a motor vehicle and calculates definite;
(3) confirm target axle rotating speed, its axis rotating speed is meant the rotating speed of the synchronizer outlet side of activation, and tach signal records through the sensor on the output shaft, uses speed ratio to revise;
(4) based on the input decision starting force that detects and calculate;
(5) whether monitoring velocity surpasses the limit value that calculates based on input; Speed is confirmed through confirm the variance ratio of shift fork position based on foregoing input; Velocity constraint obtains through the table of looking into demarcation, if the velocity constraint that obtains of tabling look-up is exceeded, then changes current power;
(6) confirm the starting force in moment of torsion stage based on the table of looking into a demarcation, this coordinate of demarcating form is foregoing through detecting and calculate the input that obtains;
(7) monitor the rotating speed gradient and whether surpass the limit value that calculates based on input,, then change the size of power if be exceeded by looking into the velocity gradient restriction of demarcating the form acquisition;
(8) the decision required starting force in position of reaching home wherein, after synchronizer combines fully and removes combination force, is judged as and reaches the final position;
(9) monitoring arrives the required time of final position and whether surpasses the limit value that calculates based on input, if demarcate that change in location gradient limit value that form obtains is exceeded then the size that changes power through looking into;
(10) if speed, rotating speed and the limit value in any stage of position in the stage are exceeded then adjust basic power, applied force when wherein basic power began for each stage.Adjustment power is stored in the form among the TCU, and this form and basic power form have same parameter.
Said method further comprises step: based on definite once more continuously gearshift power of gearshift time.
Said method also comprises the steps: to confirm vehicle acceleration, based on acceleration modifying target limit value; Therefore, when acceleration was higher, the simultaneous force that applies will correspondingly increase, because this moment, NVH receptance reduced and car load power character requirement crash change of speed.
Said method further comprises step: confirm the pressure of two clutches, just begin control procedure up to reaching certain threshold values, threshold values depends on demarcation, changes in case threshold values is exceeded change procedure of generation or triggers control.This mainly is an extra control sequential that is directed against DF515 specially, but adds the not restriction of design that therefore this control is used in other as additional methods, however interpolation inspection clutch moment of torque and * *? Step be significant.
In the said method, step that wherein confirm to accomplish each stage needed time of gearshift further comprises: measure and accomplish required time in each stage that gear selects and measured value is stored in the database; Mean value based on previous storing value and new measured value is worth according to axle rotating speed and object gear memory time; Whether transfinite according to the time and to judge whether to make a mistake.
It is thus clear that the control of this method mainly is with the open loop form, can obtain the control of high stability, even the precision of electro-hydraulic control system own is not high, but more high-resolution control is more expensive usually, so The present invention be directed to the pusher of low expense DCT control.
This method allows coarse pressure demand and bigger open loop and has adaptive dependence control, and the gear shift of simplification realizes, is not to be to adopt low expense control electromagnetic valve in the DCT control as pusher's feedback.In addition, because the minimizing that DCT controls cost obtains more competitive advantage.Because exquisite must the shortage, so control the exquisite degree that can reduce automobile in any case.In the suggested range of this controlling method, the exquisite degree that reaches minimum satisfied standard can be provided still.
Description of drawings
Fig. 1 is a schematic diagram, has described two clutches and how to have utilized this method by invention to control.
Fig. 2 is the hydraulic principle control graph of a DCT gearbox, and synthesizes with the gear driving, and expression the invention provides the control of Fig. 2.
Fig. 3 is a simple coordinate diagram of the inventive method, is used for controlling the position versus time that two clutch speed-changing gear boxes drive.
Fig. 4 is a simple coordinate diagram of the inventive method, is used for controlling the input and output speed reduced time of two clutch gearbox synchronizers.
Fig. 5 is the block diagram flow chart of one group of details of the inventive method, is used in the positive moment of torsion of two gears lowers category process, to the control of two clutch gearboxes.
Embodiment
Characteristics of the present invention and advantage are described in above literal, below reading, behind description and the Figure of description, just can understand the present invention better.
Followingly describe the present invention according to accompanying drawing:
The controlling method that two clutch gearboxes pass through to be showed is controlled, and referring to showing schematic diagram on Fig. 1, two clutch gearboxes 101 comprise two groups of clutch components, on 102 and 103, shows.104 what show is the odd number input shaft, and 105 what show is the even number input shaft.The odd even diaxon is parallel, and the 106th, output shaft, the 107th, reverse gear countershaft, a plurality of synchronizers show in 108,109 and 110.
The moment of torsion that DCT 101 transmits from motor, has arrived on the wheel to live axle through selectable gear ratio at last.The transfer route of DCT 101 is that the moment of torsion from motor is delivered to clutch 102 or 103, through strange input shaft 104 or even input shaft 105, beats on the input shaft and is building gear, links to each other with output shaft 106 top gears.Gear on strange input shaft 104 and even input shaft 105 comes driving wheel through output shaft 106 always.Only when linking to each other with synchronizer 110 machinery, extension to belong to gear at the odd number input shaft.In like manner, only when linking to each other with synchronizer 110 machinery, extension to belong to gear at the even number input shaft.If two input shafts 104 and 105 have all been selected current gear under synchronizer, the moment of torsion from motor passes to power on the output shaft through connecting clutch 102 or 103 so.To output shaft 106, gear switch is driven clutch moment of torque through reducing in the state of extension underdrive power for any input shaft 104 or 105 gears, produces up to wear smooth, and meanwhile, the clutch of unlatching increases moment of torsion up to switching beginning when the position.
Suppose that odd number input shaft 104 provides moment of torsion to output shaft 106 through strange clutch, even clutch is not connected on the output shaft 106, and gear selects then to have demand.This generic operation is called as the pre-hung gear, and gear hangs up in advance under the situation that does not influence automobilism exactly.
So extremely important link is exactly that gear carries out gear through synchronizer 108,109 and 110 and hangs up or extract.As shown in Figure 1, in the DCT 101 of this example, 5 synchronizers are arranged, wherein 109 are used for 2,4 grades, 110 be used for 3,5 grades and one independent 108 be used for reverse gear synchronizer.Two a pair of synchronizers, the bi-directional drive synchronizer promptly when being shifted out from middle neutral gear, hangs up gear on one side to the right, hangs up the another side gear left.For independent synchronizer, as shown in fig. 1, it moves the right is engage a gear, and the left side is a neutral gear.
Through using ECU, the control of being spoken of among the present invention becomes and realizes easily.The description of described ECU element itself has been surpassed this invents outside the described scope; In any case; It need manage control logic; Provide needed voltage, signal, hydraulic pressure to come gearbox 101 is operated, particularly involved gear combined function among the present invention.
The control of ECU is to obtain through the electronic signal from the electro-hydraulic control unit.As schematic diagram shown in Figure 2, this is exemplified as DCT101.The description of this hydraulic control only is defined in to the control on the DCT gear selection operation and selects.Control electromagnetic valve 42 and 43 in that the control gear is selected in selected instantiation, belongs to PWM-type, is commonly called as PWM.The PWM solenoid valve provides transformable pressure, means the pulse electromagnetic threshold switch, defines dutycycle with the time ratio of on off state, and dutycycle is recently expressed with percentage.This solenoid valve is a kind ofly to realize variable pressure control with cost benefit.The pilot pressure of the solenoid valve 42,43 that the control gear is selected is provided through main pressure-limit valve 48 by oil pump 49 supplies.Variable pressure between the main oil pressure of next autonomous pressure-limit valve 48 can be realized from the minimum to the maximum through the variable force solenoid valve.
There are two variable force solenoid valves to be designated 50 and 51 respectively; Select control according to gear; Make multiple directional control valve valve 44 can provide forward hydraulic pressure to select piston 45 and 46 to gear; Then; Pulse-width regulated solenoid valve 42 and 43 optionally provides hydraulic pressure to multiple directional control valve 44, and multiple directional control valve 44 will provide pressure to select piston 45 or 46. will be applied to the right side of piston from the pressure of solenoid valve 43 to gear according to the pressure state of variable force solenoid valve 50 and 55, and will be applied to the left side of piston from the pressure of solenoid valve 42.Therefore the pressure in the solenoid valve 43 can be used for identifying 4 grades or 5 grades in the wall chart 1 according to the state of valve 44.In addition, 2 grades and 3 grades of can be used for being identified in the wall chart 1 according to the state of valve 44 of the pressure in the solenoid valve 42.
Controlling method in this patent is controlled based on the position of the synchronizer of being controlled by piston 45 and 46.The synchronizer position is measured through the pair of electrical magnet in piston 45 and 46, and sensor is arranged in the cavity that comprises piston.Therefore piston move relevant with the position of sensor, and with the linear ratio in the position of synchro converter ring.This controlling method is fully based on piston position, and by the piston position indication, the duty of power through control electromagnetic valve 42 and 43 that is applied on the piston recently obtains.
Describe in the method that is mainly reflected in 9 of this patent.Method 9 starts from starting block 11, when gearbox control unit logic and hardware have confirmed that a gear is selected request to come clutch for gearbox to switch to prepare, and proceeds to decision piece 12, and which gear what piece 12 decision requests were switched be.In procedure block 13, being based in the synchronizer relatively, Check point and rate calculated decide target axle rotating speed.In procedure block 14, detect the current axis rotating speed.In procedure block 15, confirm the action starting force based on the form of looking into a demarcation, this demarcates form based target gear, current axis rotating speed and target axle rotating speed and confirms.This is presented among Fig. 3, and it responded like the phase I among Fig. 3.Behind the decision starting force, the speed and the linear rate that move will be monitored according to the time, and in procedure block 16, if during the restriction that speed is confirmed greater than preliminary election, simultaneous force will be changed.These limit values are stored with the mode identical with starting force, and with gear, electric current is relevant with rotating speed of target.In addition, if these limit values are exceeded, the power on the piston also can be reduced, and is stored in the form based on the input of the above description new value as starting force.Simultaneously, TOT Transmission Oil Temperature is also monitored, and the dutycycle of solenoid valve 42 and 43 is compensated the response of different pressures in the compensation electromagnetic valve.This compensation is made in the zones of different of control logic, and to the compensation description only be to describe as information.
Referring to Fig. 5, in module 17, control moves to the control field, Fig. 32 on show.In this stage, control is accomplished by control rate variation ratio.This is described with the speed stage 38 of control.Can be more clearly visible the ratio that control rate changes at Fig. 4, speed moves to target axle speed 38 by current axle speed 31.It is to depend on dynamics that axle speed changes ratio 32, and the computational methods of dynamics are exactly the controlling method that this patent is explained.In module 17, be used for control rate originally calibration scale (store object gear, current axis speed, actual axle speed is monitored corresponding target) decides through searching.It is linear that target is based on object time of accomplishing velocity variations, if accomplish actual speed big than expectation scope in module 18, dynamics needs to change so.This scope stores gear originally, current gear and target velocity with same situation.In addition, if scope has surpassed the power that piston has reduced, save as new look-up table numerical value.Originally dynamics is based on the input of describing before.
In module 19, control moves to the control field, Fig. 33 on show.In this stage, control is realized by positioning control.This location status 37 with control is described.Can be more clearly visible the control of configuration at Fig. 3, have sufficient force " canine tooth " to move the synchronizer oversleeve, let synchronizer contact, still will avoid giving more power,, can cause the problem of NVH if it is too big to contact power with gear to final position.In module 9, originally to the power of speed controlling from checking decision in the calibration scale (store object gear, current axis speed, actual axle speed is monitored corresponding target).After decision power originally, be the actual axle speed that detects with relative target then.The target location is to determine through the temperature in object gear and the current oil groove.These are in module 19 monitoring.When the position surpassed the preposition target, dynamics reduced fast.Before the final position arrives or after contrast target.If the range position that surpasses, the piston dynamics also reduces, with being stored into new final position value of tabling look-up, based on that kind described above.In addition, if after dynamics reduces, the position moves to outside the gear positions, and the target location of storage can adapt to.
If gear does not shift out from the target location, gear realizes being regarded as completion, and method is accomplished.
Module 22, gear realize that next step control is prepared by system.
Claims (5)
1. method of controlling the wet type double-clutch speed changer is particularly controlled the method that gear combines through controlling cheaply hydraulic system, it is characterized in that said method comprising the steps of:
(1) confirm an axle moment of torsion, the synchronizer that its axis moment of torsion refers to activate obtains this moment of torsion at the moment of torsion of engine side through speed ratio and gearbox loss correction Engine torque;
(2) object gear of definite request;
(3) confirm target axle rotating speed, its axis rotating speed is meant the rotating speed of the synchronizer outlet side of activation, and tach signal records through the sensor on the output shaft, uses speed ratio to revise;
(4) based on the input decision starting force that detects and calculate;
(5) whether monitoring velocity surpasses the limit value that calculates based on input; Said speed is through confirming that based on foregoing input the variance ratio of shift fork position confirms that velocity constraint obtains through the table of looking into demarcation, if the velocity constraint that obtains of tabling look-up is exceeded, then changing current power;
(6) confirm the starting force in moment of torsion stage based on the table of looking into a demarcation, this coordinate of demarcating form is foregoing through detecting and calculate the input that obtains;
(7) monitor the rotating speed gradient and whether surpass the limit value that calculates based on input,, then change the size of power if be exceeded by looking into the velocity gradient restriction of demarcating the form acquisition;
(8) the decision required starting force in position of reaching home wherein, after synchronizer combines fully and removes combination force, is judged as and reaches the final position;
(9) whether the required time of monitoring arrival final position surpasses the limit value that calculates based on input, if be exceeded through looking into the change in location gradient limit value of demarcating the form acquisition, then changes the size of power;
(10) if speed, rotating speed and the limit value in any stage of position in the stage are exceeded then adjust basic power; Applied force when wherein basic power began for each stage; Adjustment power is stored in the form among the TCU, and this form and basic power form have same parameter.
2. method according to claim 1 is characterized in that: further comprise step: confirm gearshift power continuously once more based on the gearshift time; Wherein, the gearshift time calculates respectively, depends on shift speed and output shaft change in rotational speed rate.
3. the method described in the claim 1 is characterized in that: also comprise the steps: to confirm vehicle acceleration, based on acceleration modifying target limit value.
4. the described method of claim 1, it is characterized in that further comprising step: confirm the pressure of two clutches, wherein clutch pressure is recorded by the pressure transducer that is arranged in the clutch; Just begin control procedure up to reaching certain threshold values, threshold values depends on demarcation, changes in case threshold values is exceeded change procedure of generation or triggers control.
5. method as claimed in claim 4 is characterized in that: step that wherein confirm to accomplish each stage needed time of gearshift further comprises: measure and accomplish required time in each stage that gear selects and measured value is stored in the database; Mean value based on previous storing value and new measured value is coordinate axes value memory time with axle rotating speed and object gear; According to whether transfiniting the average time of the time value of last time cycle of the time value of current measurement and storage judge whether to make a mistake.
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| CN2012100821485A CN102606724A (en) | 2012-03-26 | 2012-03-26 | Method for controlling wet type dual clutch transmission |
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| CN2012100821485A CN102606724A (en) | 2012-03-26 | 2012-03-26 | Method for controlling wet type dual clutch transmission |
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| CN103244663A (en) * | 2012-08-24 | 2013-08-14 | 重庆青山工业有限责任公司 | Method of controlling position engagement for wet dual-clutch transmission |
| CN103291903A (en) * | 2013-02-01 | 2013-09-11 | 重庆青山工业有限责任公司 | Method for controlling main oil pressure of dual clutch transmission |
| CN103291905A (en) * | 2013-01-18 | 2013-09-11 | 重庆青山工业有限责任公司 | Control method for gear pre-selection for dual clutch transmission |
| CN103867702A (en) * | 2012-12-13 | 2014-06-18 | 上海汽车集团股份有限公司 | Double-clutch type automatic transmission fork shifting gear engaging force dynamic self-adapting method |
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| CN109424739A (en) * | 2017-09-01 | 2019-03-05 | 上海汽车集团股份有限公司 | A kind of double-clutch speed changer pressure adaptive method of adjustment and device |
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| CN113639034A (en) * | 2021-08-23 | 2021-11-12 | 安徽江淮汽车集团股份有限公司 | Gear shifting control method for 2-speed AMT (automated mechanical Transmission) transmission of commercial vehicle |
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